I'm in a similar boat. My wife will be going on her 1st (ever) Polydate in a couple weeks. Due to the distances involved, she and her friend are meeting for the first time in a remote location and if things click, will be spending the weekend together.
Intimacy is expected and I am pretty good with it. I am sure I will have "moments" over the weekend - but I am sure the kids will keep me busy and I have some time scheduled for myself in the evenings to do things that I don't have a lot of time for anymore